Table 4.

Degree of agreement between disease activity states based on BASDAI and ASDAS-CRP cut-off values.

	ASDAS-CRP <1.3	1.3 ≤ASDAS-CRP <2.1	2.1 ≤ASDAS-CRP ≤3.5	ASDAS-CRP > 3.5
	n = 130	n = 180	n = 154	n = 25
BASDAI <2.1	107 (82.3)	83 (46.1)	19 (12.3)	0 (0.0)
2.1 ≤ BASDAI <3.1	19 (14.6)	57 (31.7)	30 (19.5)	0 (0.0)
3.1 ≤ BASDAI ≤ 3.7	2 (1.5)	22 (12.2)	33 (21.4)	2 (8.0)
BASDAI > 3.7	2 (1.5)	18 (10.0)	72 (46.8)	23 (92.0)

BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; ASDAS, Ankylosing Spondylitis Disease Activity Score; CRP, C-reactive protein.

Weighted kappa: 0.464, p < 0.001.